Here's some gamebreaking bug i'd like to report :

The Hag fight : I tried to ambush her, which resulted on a random dialogue with the Hagg, THEN I was still hidden and managed to ambush her. At low life she fled, I met her in her lair, ambushed her again, got into dialogue AGAIN, after the dialogue I was still in ambush mode AGAIN. Then the ultimate bug happen: she was looking some random place while I was able to shot arrow at her until she died, and it never started a fight (even if I failed several time to the sneak check). Good for me I guess.

Spider Queen: yeah that one spider that summon a ridiculous amount of baby. Well I tried to destroy the eggs first but it was not at all that easy (it seems borderline impossible). So instead, I won by random RNG were the spider Queen decided to randomly run all the way to the entrance of the cave while I cleaned up all the other spider. I then just had to sneak up on her and kill her swiftly. I believe it come from her AI, trying to stay the further away from the player for some reason ( i was playing Hide and seek to heal my PJ when she decided it was no longer worth it. btw, balance that fight... it is REALLY HARD.

Mud mephit : seems to just be able to summon a ridicule amount of other mephit and do nothing else while the ia seems to struggle deciding what to do (resulting on a frustrating long wait time between your turns, the whole fight took me 1 hour). That bug make you lose the fight by boring you to death (seriously fix that for the other alpha tester).

Cheesing with bridges: a lot of fights have been rendered trivial by using a bridge and a good old fashion darkness spell, by example the outside of the goblin citadel, when I have see a bridge before the fight, I send one guys to trigger them, lead them out of position on the bridge, caster darkness and what usually happen is that they block each other in the darkness fog, and only one come out of it at the time. I’ve been using the bridge every time I had the chance, since it make those fight ridiculously easy. Also of interest is the AI of the human priestess in that camp that was stuck on a platform for some reason and couldn’t reach the bridge (can’t remember her name).